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Fair Value Accounting, Carrying Value and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Financial instruments not marked-to-market [Abstract]    
Long-term debt, excluding debt issuance costs $ 1,446,931 $ 1,601,816
Carrying Value [Member]    
Financial instruments not marked-to-market [Abstract]    
Cash equivalents 16,600 39,700
Restricted cash equivalents 24,115 24,001
Long-term debt, excluding debt issuance costs 1,300,300 1,368,354
Estimated Fair Value [Member]    
Financial instruments not marked-to-market [Abstract]    
Cash equivalents 16,600 39,700
Restricted cash equivalents 24,115 24,001
Long-term debt, excluding debt issuance costs 1,446,931 1,601,816
Cleco Power [Member]    
Financial instruments not marked-to-market [Abstract]    
Long-term debt, excluding debt issuance costs 1,394,931 1,544,816
Cleco Power [Member] | Carrying Value [Member]    
Financial instruments not marked-to-market [Abstract]    
Cash equivalents 14,800 34,700
Restricted cash equivalents 24,094 23,980
Long-term debt, excluding debt issuance costs 1,248,300 1,311,354
Cleco Power [Member] | Estimated Fair Value [Member]    
Financial instruments not marked-to-market [Abstract]    
Cash equivalents 14,800 34,700
Restricted cash equivalents 24,094 23,980
Long-term debt, excluding debt issuance costs $ 1,394,931 $ 1,544,816